If \( l=\int \sec ^{2} x \operatorname{cosec}^{4} x d x=A \cot ^{3}...

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If \( l=\int \sec ^{2} x \operatorname{cosec}^{4} x d x=A \cot ^{3} x+B \tan x+C \cot x+D \) then
\( \mathrm{P} \)
(1) \( A=-\frac{1}{3} \)
(2) \( B=2 \)
W
(3) \( C=-2 \)
(4) none of these
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